feat(sdk): Update `message-utils` to mimic `MigrateWithdrawalGasLimit`

message-utils: use BigNumber

feat(op-node): Stub Mainnet Chain Config

op-stack: Validate prefixed Environment Variables

feat(pops): Flag Tests for the Challenger

feat(pops): Dispute Game Contract Interfaces

fix(ctb): Remove unused mainnet artifact

feat(pops): Clobbered pops/dispute-game-contracts, seaport-style

fix(op-proposer): Missing CheckRequired Invocation

Add Base Goerli chain ID and addresses to JS SDK

ci: Increase timeout for op-program verifying goerli.

ci: Exclude explorer.optimism.io from link checker.

It regularly rejects requests from CI due to DoS prevention even though the link is valid.

Needs extra time when the batcher is delayed getting data on-chain.

feat(pops): Refactor Challenger for Testability

feat(sdk): Add a bedrock warning